DEMA CPM 310 G User Manual

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Current Transformer Settings Menu
Current Transformer Settings Menu is a declarative
menu of high importance for the correct operation of
CPM 310 G, where the primary and secondary nominal
current values of the phases and the earth are declared
to CPM 310 G, as well as earth protection range setting
is done.
DEMA CPM 310 G is designed to comply with various
types of current transformers – keeping only one type
of overcurrent protection relay in inventory is made
possible thanks to this feature of CPM 310 G.
See the below explanations for detailed information on
the options in the menu.
Primary Phase Nominal Current
This declarative field is where the primary phase
nominal current is set in amperes. The setting range is
(1 – 9,999) A. DEMA CPM 310 G evaluates the primary
phase current values using the secondary signals and
the declaration on this field; therefor, entering
inappropriate values to this field will result in wrong
calculations to be displayed on the alarm and records
menus.
Secondary Phase Nominal Current
This informative field is where the secondary phase nominal current is set in amperes. The options are
1 A and 5 A. While DEMA CPM 310 G handles and evaluates the secondary signals not according to
this field but the dip-switch settings, however, selecting the wrong option on this field may misinform
the users. Please see the Dip-Switch Settings section for detailed information on the secondary signal
processing principles of CPM 310 G, at p.47 of this manual.
Primary Earth Nominal Current
This declarative field is where the primary earth nominal current is set in amperes. The setting range
is (1 – 9,999) A. DEMA CPM 310 G evaluates the primary earth current values using the secondary
signals and the declaration on this field, therefor, entering inappropriate values to this field will result
in wrong calculations to be displayed on the alarm and records menus. The setting must be done in
the same value with the set Primary Phase Nominal Current value, if a distinct residual current
transformer is not used. 
Main Screen » Menu »
CT Settings

DEMA CPM 310 G Specifications

General

Brand	DEMA
Model	CPM 310 G
Category	Relays
Language	English